Ed stays on Earth, and watches his twin Rob fly away in a rocket. Ed sees Rob\'s clock run more slowly, so he expects Rob to age more slowly. 2. From his vantage point in the rocket. Rob watches his twin Ed and the planet Earth moving away from him. Rob sees Ed\'s clock run more slowly, so he expects Ed\'s to age more slowly. 3. If Rob returns to Earth, he will be younger than Ed. 4. An electron that has been accelerated through a potential difference of + 10 kV has the same kinetic energy as a proton that has been accelerated through a potential difference of - 10 kV. 5. To a good approximation, the momentum of an electron that has been accelerated through a potential difference of 500 times 10^6 Volts is 500 Me V/c. 6. Planck used a quantum hypothesis to explain how the color of a heated object changes with temperature. 7. The more uncertain a particle\'s position, the more uncertain its momentum. 8. The de Broglie wavelength of a neutron is smaller than the dc Broglie wavelength of an electron with the same momentum. 9. For an electron in a square well, the separation between successive energy levels increases as the energy increases. 10. For an electron in a hydrogen atom, the separation between successive energy levels increases as the energy increases. Solution 1) true. It can be explained by time dilation. 2) False. He sees Ed\'s clock run more quickly. 3) true. 4) true.

1. Ed stays on Earth, and watches his twin Rob fly away in a rocket. Ed sees Rob's clock run
more slowly, so he expects Rob to age more slowly. 2. From his vantage point in the rocket.
Rob watches his twin Ed and the planet Earth moving away from him. Rob sees Ed's clock run
more slowly, so he expects Ed's to age more slowly. 3. If Rob returns to Earth, he will be
younger than Ed. 4. An electron that has been accelerated through a potential difference of + 10
kV has the same kinetic energy as a proton that has been accelerated through a potential
difference of - 10 kV. 5. To a good approximation, the momentum of an electron that has been
accelerated through a potential difference of 500 times 10^6 Volts is 500 Me V/c. 6. Planck used
a quantum hypothesis to explain how the color of a heated object changes with temperature. 7.
The more uncertain a particle's position, the more uncertain its momentum. 8. The de Broglie
wavelength of a neutron is smaller than the dc Broglie wavelength of an electron with the same
momentum. 9. For an electron in a square well, the separation between successive energy levels
increases as the energy increases. 10. For an electron in a hydrogen atom, the separation
between successive energy levels increases as the energy increases.
Solution
1) true. It can be explained by time dilation.
2) False. He sees Ed's clock run more quickly.
3) true.
4) true